Glasgow Central has a spiral ramp in Hope Street which took vehicles up to platform and passenger levels once through the Caledonian Railway coat of arms ramp exit, (taxis usually) turned left to run behind the old destination boards building to exit through an exit arch further up the street - directly opposite Waterloo Street. If instead of turning left, you went right, this was an ultra-wide platform between 11 & 12 that doubled as the station car park and Mail van traffic. This was eventually modified, initially to create Platform 11a which was outside the station canopy and a long walk away. Whilst the undercroft was opened up to allow a descending ramp that vehicles could exit to Oswald Street and head off or access the NCP car park.
All this was updated with the most recent revision, where the wide roadway platform, 11a and ramp was completely removed, with tracks to service the intended Glasgow Airport Rail Link (GARL). This changed the platform numbering from 11-14 at the upper level, and no vehicle access.